resize jfs, gparted and swap, problems

[Uwe Brauer]

Hello

I am running Kubuntu 10.04 and recently a doubled my RAM, so I thought
to double my swap partition since I hibernate quite a lot.

Kubuntu is running on an extended partition, one part is for the whole
file system running jfs, the other is the swap partition:
/dev/sda5            6494       29915   188130568+  83  Linux
/dev/sda6           29915       30401     3908488+  82  Linux swap / Solaris

So I boot a live CD, make sure that neither /dev/sda5 nor /dev/sda6 are
mounted, swap is turned off, and I run gparted.

I cannot resize /dev/sda5. 

Is this the fault of gparted or jfs is not designed this way. 

Any comments?

thanks

Uwe Brauer